body{margin:0;background:#111;color:#eee;font:18px/1.7 system-ui,sans-serif}main{max-width:740px;margin:auto;padding:32px 24px}h1{font-size:clamp(2rem,6vw,3rem);line-height:1.15}h2{line-height:1.3;margin-top:2rem}a{color:#ff8d8d;text-underline-offset:4px}.cta{display:inline-block;background:#b91c1c;color:white;padding:12px 20px;border-radius:8px}footer{border-top:1px solid #444;margin-top:3rem;font-size:.85rem;color:#aaa}a:focus-visible{outline:3px solid white;outline-offset:4px}
.check-card{border:1px solid #555;border-radius:12px;padding:24px;margin:32px 0}.check-card h2{margin-top:0}.check-card label{display:block;margin-top:18px}.check-card select{display:block;box-sizing:border-box;width:100%;max-width:100%;padding:12px;background:#222;color:#fff;border:1px solid #888;border-radius:6px;font:inherit}.check-card button{font:inherit;border:0;cursor:pointer;margin-top:24px}.check-card select:focus-visible,.check-card button:focus-visible{outline:3px solid #fff;outline-offset:4px}#check-result{border-top:1px solid #555;margin-top:24px}[hidden]{display:none}